If sown too early in the season, corn will not grow well. Wait until soil is over 55° F. Only treated seeds of cold-germinating varieties should be planted before that time.
Many types of sweet corn must be isolated from other corn to limit pollen crossover. This can be achieved by using varieties with different maturity timing, sowing at different times, or separating by physical location.
Full sun is necessary. Sow seeds 1" deep and space 6-7" apart. Rows should be approximately 32" apart. Untreated seed should be planted more densely. To ensure proper pollination, think "four": plant in blocks of at least four rows, each at least four feet long.
Conditions vary depending on location. For the best information regarding each region, we advise you to consult your local extension service.
Corn is ready to eat when the silk turns dry and dark brown and kernels are milky.